Seasonal produce
When are chestnuts in season?
Fresh chestnuts are a fall harvest, not a December orchard crop. Oregon State University Extension (FS 146) says chestnuts ripen in September and October over a period of two to four weeks. University of Missouri Extension (AF1007) says harvest in the Midwest occurs in September and October, depending on cultivar and the growing season.
Chestnut season at a glance
Oregon State FS 146: mature when the nuts drop; ripen September–October over 2–4 weeks. Missouri AF1007 (Chinese chestnuts): Midwest harvest September and October. Chestnuts you roast in December were harvested in the fall, not in winter.
By region (wild American chestnut)
The American Chestnut Foundation’s field guide, which covers the wild American chestnut (Castanea dentata), says to harvest when the burs begin to open, around the last week in September and first week in October in the mountains from Georgia north to Maine; in the Piedmont of the Carolinas, Georgia, Alabama, Mississippi and Tennessee, it can be as early as mid-August.
Why fresh chestnuts are perishable
Oregon State: chestnuts are fairly perishable, unlike hazelnuts and walnuts. They are a high-starch, low-fat food more like an apple or potato than a tree nut. Clean and refrigerate soon after harvest to prevent mold and decay. Fresh chestnuts in the shell last about 2 months in the refrigerator; frozen fresh last 2 to 3 months at 32°F and 1 year at 0°F. Storing outside a fridge or freezer is not practical — they usually mold within 2 weeks.
Curing for sweetness
Oregon State: some people “cure” chestnuts a few days at room temperature to speed starch-to-sugar conversion. The same conversion happens slowly under refrigeration, so curing is not necessary for nuts that will be stored in the fridge.
Safety: horse-chestnuts are poisonous
Oregon State University Extension (FS 146): “Take care not to consume horse-chestnuts, which are poisonous. Horse-chestnuts are covered with a leathery, sometimes spiny fruit capsule, which contains two or three glossy seeds or nuts. The leaves originate from the same point and are divided like a fan into 5 to 7 large toothed leaflets, which are 4 to 10 inches long. Edible chestnuts have a husk that is covered with sharp, stiff bristles. The husk splits to reveal two or three nuts. The leaves are 3 to 7 inches long, with sharply toothed edges. The origins of the leaves alternate along the stem.”
Roasting and boiling (Oregon State times)
Oregon State: undried chestnuts can be boiled or roasted. To boil, cover with water, bring to a boil, then simmer 30 minutes; drain and cool — shell and skin should come off easily. To roast, first cut the outer shell (slice or X) so they don’t explode; oven-roast at 375°F for 20 to 25 minutes, or roast on the stove over moderate heat in a wok or large fry pan, stirring often.
Holiday use
Chestnuts for the holidays come from the fall harvest. See pecans, sweet potatoes, Brussels sprouts, and the November produce guide.
Recipes and related guides
When are pecans in season? · When are sweet potatoes in season? · When are Brussels sprouts in season? · November produce guide · Produce checklist
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